8 Responses. > 1  the Moon takes an elliptical path around the Earth. The planets make nearly elliptical orbits around the Sun, close enough for reasonable approximations, but the Moonâs Orbit around the Earth is sufficiently influenced by the Sun that it follows a path detectably different from an ellipse.
Quick Answer. In 1896, French scientist Antoine Henri Becquerel discovered radioactivity which was an early contribution to atomic theory. He discovered this phenomenon while experimenting with uranium and a photographic plate. Continue Reading.
Bohr's model of the atom. Niels Bohr (7 October 1885 â 18 November 1962) was a Danish physicist who helped discover quantum physics, the structure of the atom, and the atomic bomb. Bohr was awarded the Nobel Prize in 1922 for, in short, discovering the quantization of atomic energy levels.